643053321320 has 128 divisors (see below), whose sum is σ = 1567331804160. Its totient is φ = 236522373120.

The previous prime is 643053321301. The next prime is 643053321373. The reversal of 643053321320 is 23123350346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18423485 + ... + 18458355.

It is an arithmetic number, because the mean of its divisors is an integer number (12244779720).

Almost surely, 2^643053321320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643053321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783665902080).

643053321320 is an abundant number, since it is smaller than the sum of its proper divisors (924278482840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643053321320 is a wasteful number, since it uses less digits than its factorization.

643053321320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35523 (or 35519 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 32.

Adding to 643053321320 its reverse (23123350346), we get a palindrome (666176671666).

The spelling of 643053321320 in words is "six hundred forty-three billion, fifty-three million, three hundred twenty-one thousand, three hundred twenty".